Creep Buckling of Steel Columns Subjected to Fire

这项研究的目的是发展计算材料蠕变对火灾下建筑结构钢柱屈曲影响的方法。研究方法包括结构钢的蠕变试验和钢柱在结构火灾工程中所关注的应力和温度范围内的蠕变屈曲试验，建立蠕变屈曲的分析和计算模型，以及建立适用于设计实践的蠕变屈曲预测方程。实验研究将集中在ASTM A992钢上，这是美国建筑施工中最常见的结构钢等级，其升温数据非常少。该奖项的成果包括结构钢柱的高温实验数据库；评估钢柱受火安全性的分析和设计模型；对结构工程专业的学生进行建筑物耐火性能的教育；以及对消防员进行结构消防安全的教育。柱子是对建筑结构安全至关重要的元素，柱子在火灾中发生故障可导致倒塌和生命损失。研究结果将为钢结构柱在火灾下的安全性评估提供重要的工具，并将有助于改进建筑结构火灾安全设计的实践。研究生和本科生将从参与研究和加强结构消防工程课程中受益。消防员将从这一奖励中受益，因为他们提供了关于火灾中建筑物的安全和倒塌风险的培训。

The objective of this research is to develop methods to account for the effects of material creep on the buckling of structural steel columns in buildings subjected to fire. The research approach includes experiments on creep of structural steel and experiments on creep buckling of steel columns for stress and temperature regimes of interest in structural-fire engineering applications, development of analytical and computational models for creep buckling, and the development of predictive equations for creep buckling suitable for use in design practice. The experimental studies will focus on ASTM A992 steel, which is the most common grade of structural steel used in building construction in the US, and for which very little elevated temperature data exists. Deliverables for this award include a database of elevated temperature experiments on structural steel columns; analytical and design models for evaluating safety of steel columns subjected to fire; education of structural engineering students on fire performance of buildings; and education of fire fighters on structural-fire safety.Columns are elements critical to the safety of building structures, and failure of a column in a fire can lead to collapse and loss of life. The results of this research will provide an important tool for evaluating the safety of steel building columns subjected to fire, and will contribute to improved practices for structural-fire safety design of buildings. Graduate and undergraduate students will benefit from involvement in the research and from the enhancement of courses on structural-fire engineering. Fire fighters will benefit from this award from training provided on the safety and collapse risk of structures subjected to fire.